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Cellulose: structure and breakdown. (a) Generic representation of the plant cell wall (taken from https://commons.wikimedia.org/wiki/File:Plant_cell_wall_diagram.svg). (b) Structure of a single β-1,4-d-glucan chain. (c) Structure of the disaccharide cellobiose generated by the action of cellobiohydrolases. (d) Mechanism of a family GH3 retaining β-d-glucosidase; hydrolysis occurs via a covalent glycosyl-enzyme intermediate.
